@mixin linear-gradient($direction,$color1,$color2){
    background: -webkit-linear-gradient($direction,$color1,$color2);
    background: -moz-linear-gradient($direction,$color1,$color2);
    background: linear-gradient($direction,$color1,$color2)
}
@mixin flex-center($direction:row){
    display: flex;
    justify-content: center;
    flex-direction: $direction;
    align-items: center;
}
@mixin flex-justify ($direction:row){
    display: flex;
    flex-direction: $direction;
    justify-content: space-between;
}
@mixin p_l_r($px) {
    padding-left:$px ;
    padding-right: $px;
}